JPH025886Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a spray nozzle for repairing the inner surface of a molten metal container including a furnace or the like by spraying.

[Prior art]

Conventionally, such repair work has been carried out by pouring, dry spraying, and wet spraying.

However, such wet spraying construction had the following problems.

B. Sagging may occur at the tip of the nozzle, and the nozzle may become clogged due to the growth of this sagging.

(b) Since the wet material is fed to the nozzle by a pressure pump, the wet material is fed in a wave state,
This causes a so-called breathing phenomenon, which results in non-uniform spraying and reduces the adhesion rate.

[Purpose of invention]

An object of the present invention is to provide a spray nozzle structure that can spray wet materials uniformly and without causing a breathing phenomenon, and can significantly improve the deposition rate.

[Structure of the idea]

In this invention, the nozzle tip is composed of a plurality of concentric tubular bodies, the plurality of spaces formed between the tubular bodies are alternately used as material passages and gas passages, and the internal space is formed behind the plurality of tubular bodies. A material pressure-feeding pipe having a distribution valve for preventing material wave motion, a material distribution pipe surrounding the material pressure-feeding pipe, and an annular gas inflow box are provided, and the material pressure-feeding pipe is communicated with the material passage through the distribution valve and the material distribution pipe. The present invention relates to a wet spray nozzle for monolithic refractories, characterized in that an annular gas inflow box communicates with a gas passage.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

FIG. 1 is a cross-sectional front view of a spray nozzle according to the present invention, and FIG. 2 is a cross-sectional view taken along the line of FIG. 1.

In FIG. 1, reference numeral 1 denotes a spray nozzle communicating with a material pressure-feeding pipe 2 for pumping wet material. It is composed of a material outflow tubular body 4 having a double pipe structure, and an outer tubular body 5 concentrically surrounding the tubular body 4. With this configuration, the first and second material passages 6 and 7 are formed inside the central tubular body 3 and the material outflow tubular body 4, respectively, while the central tubular body 3 and the material outflow tubular body 4 are First and second gas passages 8 and 9 are provided between the material outflow tubular body 4 and the outer tubular body 5, respectively.
is formed.

Further, 10 is a gas inflow annular box surrounding the base end of the spray nozzle 1, and a gas inflow space 11 formed inside the box 10 is connected to the first and second gas passages 8 and 9. communicate. In order to enable the above-mentioned communication, the material outflow tubular body 4 is composed of a pair of symmetrical semicircular bodies, with a first and a second
A communication passage 12 connecting the gas passages 8 and 9 is formed. In addition, 13 is an elbow attached to the outer peripheral surface of the annular box body 10 for gas inflow.

In addition, the material pressure feeding pipe 2 has a distribution valve 15 for preventing material wave motion inside it, and a support line 1 is provided inside the distribution valve 15.
A distribution valve ball 16 made of steel or ceramics and supported by 8 is mounted so as to be freely movable in the axial direction.

Furthermore, 17 is a material distribution pipe that is disposed behind the spray nozzle 1 and concentrically surrounds the material pressure feeding pipe 2, and the distribution pipe 17 communicates with the material pressure feeding pipe 2 via the distribution valve 15. It also communicates with the material outflow tubular body 5.

Next, repair work using the spray nozzle having the above configuration will be described.

Normally, the spray nozzle 1 is passed through the material pressure feed pipe 2.
The material fed to the first material passage 6 is distributed at a constant rate by the distribution valve 15 as shown by the arrow in FIG.
It is sprayed from the tip of the spray nozzle 1 onto the wall surface to be constructed through the spray nozzle 1. On the other hand, gas such as air or nitrogen gas that has flowed into the gas inflow space 11 through the elbow 13 is ejected forward from the tip of the spray nozzle 1 through the first and second gas passages 8 and 9. Such ejected gas can mix the materials uniformly and prevent the materials from spreading. In addition, the nozzle has its ejection tip constricted in order to increase the ejection pressure so that the material is strongly crimped and spread and adhered. However, since the material is fed by an intermittent extrusion pump such as a minicrete or grout pump, the restriction at the tip of the nozzle inevitably causes the material to be ejected intermittently.
In other words, a breathing phenomenon occurs. Furthermore, the constriction at the tip of the nozzle temporarily clogs the constriction with material, which in turn forces the material back backwards, thereby further increasing the suffocation phenomenon. This phenomenon becomes more severe as the difference between the nozzle diameter and the hose diameter increases. The present invention can effectively prevent the backflow of material within the material pumping pipe 2 that occurs during the material pumping operation. That is,
Because the distribution valve ball 16 momentarily closes the material pressure feeding pipe 2 due to the backflow pressure, the backflow of the material can be suppressed, thereby preventing the phenomenon of breathing. Note that after the backflow is prevented, the distribution valve ball 16 returns to its original normal operating position again, and the material can be injected from the nozzle.

[Effect of idea]

As stated above, in this invention, the material is blown out in layers together with the gas, so it is mixed uniformly and then attached to the wall surface to be constructed, so the adhesion rate can be improved. It is possible to prevent the occurrence of sagging, and furthermore, the phenomenon of breathing can be prevented by operating the distribution valve.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of a monolithic refractory wet nozzle according to the present invention, and FIG. 2 is a cross-sectional view taken along the line of FIG. 1. In the figure, 1...Blowing nozzle, 2...Material pressure feeding pipe,
3...Central tubular body, 4...Material outflow tubular body, 5
...Outer tubular body, 6...First material passage, 7...Second material passage, 8...First gas passage, 9...Second gas passage, 10...Annular box for gas inflow, 11... …
Gas inflow space, 12... communication passage, 13... elbow, 15... distribution valve, 16... distribution valve ball, 17...
...Material distribution pipe, 18...Support line.

Claims (1)

[Scope of utility model registration request] The nozzle tip is made up of multiple concentric tubular bodies, and the spaces formed between the tubular bodies are alternately used as material passages and gas passages, and there is a material wave prevention mechanism behind the multiple tubular bodies. A material pressure-feeding pipe having a distribution valve, a material distribution pipe surrounding the material pressure-feeding pipe, and an annular gas inflow box are provided. A wet spray nozzle for monolithic refractories, characterized in that a gas inflow box communicates with a gas passage.